Who runs faster

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Across
  1. 4. Cannot run
  2. 5. Can run faste tha a girl
  3. 6. Can run faster than a lion
  4. 7. Can run faster than a zebra
Down
  1. 1. Can run faster than tortoise
  2. 2. Can run faster tha a giraffe
  3. 3. Nothing can run faster